Gallocyanin dye.



UNITED STATES PATENT OFFICE.

WILHELM LOMMEL, OF ELBERFELD, GERBLANY, ASSIGNOR TO FARBEN FABRIKFN VORM. FRIEDR. BAYER 8: 00., OF ELBERFELD, GERL'IANY, A

CORPORATION OF GERMANY.

GALLOCYANIN DYE.

Specification of Letters Patent.

Patented June 11, 1907.

Application filed March 18, 1907. Serial No. 363,009.

To all whom it may concern:

Be it known that 1, Winner. LoMMnL,

l l l t t l 3 redder and purer shades.

a pure blue color and is insoluble in sodium carbonate solution. These tests readily distinguish the new dye from gallocynnin which is soluble in sodium cnrbonnte solution and dissolves in hydrochloric ncid of 20 Be with a red color.

The following example will l'urther illustrate inyinvention,the parts being by weight To 33,6 parts of gullocyanin suspended in 50 1 parts of water, 27,2 parts ol' crystallized sod um acetate are added and the resulting mixture which has to be ctmtinuously stirred j is heated to boiling at a rellux condenser llor about 4--5 hours. when the dyestu'll liltered l'rom :1 test portion dissolves in hydrochloric acid of 20 Be wit h a pure blue color and is insoluble in sodium carbonate solution. The base is liltered oil and. converted into its lrvdrochlornl.

The rcnetion is'complete' The hydrochlorid ol' the new dyestutl' forms after drying a dark green powder soluble in water with a reddish-violet. color. The new dyev is distinguished from gallocyanin from which it is produced, by the greater solubility of its hydrochlorid and by giving in printing it yields 11 )on reduction the leuco-co1npound described in my other application for Letters Patent of same date, Ser. No. 363,008.

llaving now described my invention and in whut manner the same is to be performed, what 1 claim as new and desire to secure by Letters Pntent is? The herein-described new dyestull' obtninable from gallocynnin, which dyestull is in the shape ol its hydrm-hlorid ul'ter dyeing 1 dark green powder soluble in water with n reddish-violet color, being distinguished ll'Olll gnllocynnin by the greater solubility ol' its h \'drochlorid and by giving in printing redder and purer shades than gnllocyunin: being dium carbonate solution, substantially as described.

In testimony whereol l have hereunto set. my bond in the presence ol' two subscribing witnesses.

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It is hereby certified that in Letters Petent' No. 856,537, granted June 11, 1907, upon the application of Wilhelm Lommel, of Elberfeld, Germanyrfor an improvement in Gallocyanin Dyes, an error appears in the printed specification requiring correction, as follows: In line 51, the word dyeing should readdryihg and that; the said Letters Patent should be read with this correction therein that the same may oonform I to the record of the case in the Patent Ofiice.

Signed and sealed this 16th day of July, A. 1)., 1907.

SEAL 0. 0. BILLINGS,

Acing Commissioner of Patents. 

